Originally Posted by corporate-wage-slave

He can ask for CW on a later flight if that is an option.

But the full details on how to calculate the refund is to be found in the EC261 guide in the Dashboard. There is a link in there to last year's thread, when the rules for this area were clarified to the CJEU. But in case you don't spot that link in the top of the thread, here it is:

http://www.flyertalk.com/forum/26864509-post636.html

I would have no hesitation in accepting the voucher, though absolutely beg him to photo whatever it is he signs and keep a copy extra safe. For some strange reason no-one seems to do this - or they lose their copy. This is important in terms of whether it's discretionary or regulatory compensation.